Jacobs Engineering Group Sp3d Piping Designer Interview Questions and Answers

Suction piping of a pump is the piping system that brings fluid into the pump from the source.

• Suction piping is designed to ensure a smooth flow of fluid into the pump without any air pockets or cavitation.

• The piping should be sized appropriately to prevent excessive pressure drop and maintain efficient pump operation.

• Proper alignment and support of the piping is crucial to prevent stress on the pump and ensure longevi...read more

Eccentric reducers are used in suction lines with flat side up to prevent air pockets and improve flow efficiency.

• Eccentric reducers help in preventing air pockets from forming in the suction line

• Having the flat side up ensures that any trapped air can easily escape

• Improves flow efficiency by reducing turbulence and pressure drop

• Commonly used in applications where smooth flow is critical, such as pump suction lines

Figure 8 is a type of knot commonly used in piping design to secure two ropes or cables together.

• Figure 8 knot is also known as a stopper knot due to its ability to prevent ropes from slipping through holes or other openings.

• It is easy to tie and untie, making it a popular choice for various applications in piping design.

• The figure 8 knot is often used in rock climbing, sailing, and rescue operations for its reliabilit

Control station piping is essential for regulating and monitoring the flow of fluids in a system.

• Control station piping connects various components such as valves, instruments, and equipment to control the flow of fluids.

• Proper design of control station piping ensures efficient operation and safety of the system.

• Consider factors like pressure, temperature, and material compatibility when designing control station pipin...read more

Suction piping of pump is crucial for efficient operation and performance.

• Suction piping should be designed to minimize friction losses and ensure proper flow to the pump.

• Proper sizing and layout of suction piping is essential to prevent cavitation and maintain pump efficiency.

• Consider factors such as pipe diameter, length, bends, and fittings when designing suction piping.

• Use smooth bore pipes, avoid sharp bends, and ...read more

Various pressure tests are conducted on valves including hydrostatic test, pneumatic test, and cryogenic test.

• Hydrostatic test is conducted by filling the valve with water and pressurizing it to a specified pressure to check for leaks.

• Pneumatic test involves using air or nitrogen to pressurize the valve and check for leaks or defects.

• Cryogenic test is performed at low temperatures to ensure the valve can withstand extr...read more

Safety considerations in designing piping systems are crucial for preventing accidents and ensuring the integrity of the system.

• Ensuring proper material selection to withstand the intended pressure and temperature conditions

• Implementing proper support and restraint systems to prevent excessive stress and vibration

• Incorporating adequate access points for maintenance and inspection

• Following relevant codes and standards s...read more

Expansion stress formula calculates the stress caused by thermal expansion or contraction.

• Expansion stress formula is given by: ΔL/L = αΔT, where ΔL is the change in length, L is the original length, α is the coefficient of thermal expansion, and ΔT is the change in temperature.

• The formula can be used to calculate the stress caused by thermal expansion or contraction in piping systems.

• The formula assumes that the mater...read more

Sustain stress formula calculates the maximum allowable stress for a given material under sustained loading.

• Sustain stress formula is used in piping stress analysis to determine the maximum allowable stress for a given material under sustained loading.

• The formula takes into account the material's yield strength, ultimate tensile strength, and safety factor.

• Sustain stress formula is expressed as S = (Sy/FS) + (Su/FS) * ...read more

Pinging in pipeline ASME CODE refers to the process of using ultrasonic testing to detect defects or anomalies in the pipeline.

• Pinging involves sending ultrasonic waves through the pipeline to detect any abnormalities in the material or welds.

• This technique is commonly used in the inspection of pipelines to ensure they meet the standards set by the ASME CODE.

• Pinging helps identify potential issues such as cracks, corro...read more

Corrosion coupons are used to monitor the rate of corrosion in a system and to determine the effectiveness of corrosion inhibitors.

• Corrosion coupons are small metal strips or discs that are inserted into a system to measure the rate of corrosion over time.

• They are made of the same material as the system being monitored, allowing for accurate assessment of corrosion rates.

• Corrosion coupons are typically retrieved period...read more

P&ID stands for Piping and Instrumentation Diagram, while PFD stands for Process Flow Diagram. They are both used in engineering to represent processes and systems.

• P&ID shows the piping of the process flow system, including the equipment and instrumentation used.

• PFD shows the overall flow of the process, including major equipment and control loops.

• P&ID includes more detailed information like pipe sizes, materials, and ...read more

Types of instruments used in piping engineering and their applications

• Pressure gauges - measure pressure in pipes to ensure safe operation

• Flow meters - measure the flow rate of fluids in pipes for monitoring purposes

• Temperature sensors - monitor the temperature of fluids in pipes to prevent overheating

• Level indicators - indicate the level of fluids in tanks connected to pipes for control purposes

• Control valves - regula...read more